/*
 * Copyright (C) 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package examples;

import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import com.google.caliper.Param;

/**
 * Tests various Character methods, intended for testing multiple implementations against each
 * other.
 */
@SuppressWarnings("CheckReturnValue")
public class CharacterBenchmark {

  @Param private CharacterSet characterSet;

  @Param private Overload overload;

  private char[] chars;

  @BeforeExperiment
  void setUp() throws Exception {
    this.chars = characterSet.chars;
  }

  public enum Overload {
    CHAR,
    INT
  }

  public enum CharacterSet {
    ASCII(128),
    UNICODE(65536);
    final char[] chars;

    CharacterSet(int size) {
      this.chars = new char[65536];
      for (int i = 0; i < 65536; ++i) {
        chars[i] = (char) (i % size);
      }
    }
  }

  // A fake benchmark to give us a baseline.
  @Benchmark
  boolean isSpace(int reps) {
    boolean dummy = false;
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          dummy ^= ((char) ch == ' ');
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          dummy ^= (ch == ' ');
        }
      }
    }
    return dummy;
  }

  @Benchmark
  void digit(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.digit(chars[ch], 10);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.digit((int) chars[ch], 10);
        }
      }
    }
  }

  @Benchmark
  void getNumericValue(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.getNumericValue(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.getNumericValue((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isDigit(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isDigit(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isDigit((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isIdentifierIgnorable(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isIdentifierIgnorable(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isIdentifierIgnorable((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isJavaIdentifierPart(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isJavaIdentifierPart(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isJavaIdentifierPart((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isJavaIdentifierStart(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isJavaIdentifierStart(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isJavaIdentifierStart((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isLetter(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isLetter(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isLetter((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isLetterOrDigit(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isLetterOrDigit(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isLetterOrDigit((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isLowerCase(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isLowerCase(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isLowerCase((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isSpaceChar(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isSpaceChar(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isSpaceChar((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isUpperCase(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isUpperCase(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isUpperCase((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void isWhitespace(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isWhitespace(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.isWhitespace((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void toLowerCase(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.toLowerCase(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.toLowerCase((int) chars[ch]);
        }
      }
    }
  }

  @Benchmark
  void toUpperCase(int reps) {
    if (overload == Overload.CHAR) {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.toUpperCase(chars[ch]);
        }
      }
    } else {
      for (int i = 0; i < reps; ++i) {
        for (int ch = 0; ch < 65536; ++ch) {
          Character.toUpperCase((int) chars[ch]);
        }
      }
    }
  }
}
